You've helped me SO MUCH. Thank you for putting the time into publishing these videos. I've donated (a small amount, but at least it was some) to your effort. And you have ignited my desire to pursue an EE degree ... even though I'm already a middle aged man LOL. I want to learn more. This has helped. Thanks. Keep it going!
The restoration and time involved is certainly not out of line when you consider the dedication it takes to cut down or eliminate callbacks to justify the cost of repair. "Excellent Work"
Thanks Mark, love your work. Makes one kinda wonder how many other 2270's were put together with that factory error. If Saul would have seen this he probably would have issued a recall check for x number of units either side of this one!
Great stuff. I'm also an Amateur Extra Class but I wouldn't know where to start or what to do on this type of project. Even so, love watching your work - thanks for sharing.
Your just the kind of person I'm looking for as my Marantz PM-66SE Special Edition Integrated Amplifier that I bought 18 years ago in 1998 has just died on me. $330 US equates to about £255 pounds which sounds very reasonable. Even though I only paid £229 in "98 I'm loath to throw things out that can be repaired. Plus I'd like to keep it withy marantz cd player of the same vintage. My problem is finding someone in the UK like you that doesn't rip their customers off. I find your videos really interesting even though I only have a basic knowledge of electronics. Keep up the good work.
Our service shop used to be a Marantz factory Warranty station and I thought I was on top of the World when I would get a work order ticket saying "'Dead Left/Right channel'' on a Slightly used receiver, (usually shorted Output/Finals and maybe a driver or two)! Wished now I'd took a couple home!
When can we expect a cap soldering tutorial? Got everything ready to go supplies/ tools wise to recap my MCS 3275, just waiting on that video you mentioned to get a little more confidence so I can get cracking on this project! Thanks for everything, love the videos/ your willingness to share knowledge.
At 26:50, playing "divide and conquer"! I really like it when receivers I am working on have preamp-out and main in jacks and removable jumpers. It's a good first step in narrowing down what section of the receiver is causing the problem.
I'm working on a 2220b - Thanks for all the tips you are sharing. Experience matters and your sharing is generous. If you can, I'm having trouble finding an 8 volt bulb, used to illuminate the Receiver Radio Dial pointer. No one seems to have anything close anymore. I bought some 6 volt mini bulbs from amazon but I'm afraid it will generate too much heat and melt the housing. Any ideas? I had one that I bought from RS years ago - still in the blister package. Don't think I had ever a need to use it and am going nuts looking for it.
There are small versions of flat pry bars that can be used in pairs to remove the knobs by pulling out on both sides at once. It helps to avoid bending the shaft when a knob is really stuck. Works great for me. Stanley makes them about four inches long.
Thanks Mark, I'm an amateur kit builder but with soldering abilities and I'm seriously considering recapping my 2325 this fall. I'm on the West coast. Both of the tuners have quit so I'm suspecting the power supply board. Everything else is still working. Been doing loads of research including watching your videos which have been a huge help. A pro here in town will do it for about $300, which is very reasonable, but I wonder (and worry) about the quality of the parts he would use. I'd also get a huge kick out of the satisfaction of doing it myself. I have no test equipment except a multi meter and that could be a huge problem. I've got to make a decision as the receiver is the heart of my in-home recording studio and I use it all of the time.
Just wondering if you were successful, Stu. I'm in the same boat. I can solder, but I only have a multimeter. I thought about replacing the parts and then taking the unit to someplace for them to adjust teh bias, etc.
Thanks Mark! Your video is awesome and a great help. I am restoring a 2270 for a friend. Should I replace the large 9,000 uf caps in the power supply? Where can I get them?
Nice Video.... Well my problem is lost both channels no audio for ether side could my problem be the speaker protector relay? Everything seems to light up just no outputs!! Maybe I should check the output Transistor first to make sure there working what do you think.... Thank You
Hello Mark! I've LOVED these videos, incredibly educational, especially for an amateur like me! Related to this piece, I'd like to replace some burned out bulbs behind the FM/AM display on my Marantz 2500! You make it look pretty simple accessing the bulbs from the front, including removing the front metal plate, plastic cover, then the vellum paper, and replacing bulbs as needed. However, I'd love to know: 1. What type of glue do you use for the vellum paper, and does the plastic cover require glue as well? 2. Do you need to glue back the knobs when placing them back on at the end of the re-install? 3. I've noticed the balance fader and the volume knob have a lot of noise, scratching, and what I'm assuming is corrosion. Do you have any recommendations for the right chemical to use/spray to clean them up and a safe method to access the areas you'd need to spray? Any help you can offer is incredibly helpful, and much appreciated!! :)
I think this an excellent video. I'm just a guy that dabbles a bit in repair of basic stuff. I'm replacing all the bulbs on a 2270 and hopefully cleaning all the pots. My question is how to clean the ones under the cardboard protecting 3 of them. Also they are dual function switches and are stuck together. While turning the outer knob the inner knob turns also. What chemical and is there a trick to spraying it to loosen the pots. Thanks for any response.
Hello, congratulations for your videos, they are very useful. I just removed the transistors on the right side and I do not know how they're going. Could you please tell me how they are going? Thank you
in the beginning of this video, how are you feeding the 1khz signal into a stereo AUX input on the back? the signal generator only has one lead coming out?
Mark, Hello, I have a quick question hopefully you can give some good advice. I recently bought a vintage marantz 2240b, everything works. It just that once I connected it to the speakers I hear a low humming sound and it’s in every source in the selector. Thank you in advance.
I am not a trained technician, but I have successfully repaired a few things including my 1978 fosgate pr250 car amp in which I replaced some power supply transistors and outputs and drivers and resitors and main power caps. Now I have a problem with my marantz 2230. When turning on it makes a scratchy sound, and when turned off. I hooked one meter to the large 4700mfd cap, and two more to the smaller 2200mfd caps. 71v on the big and 31 to 32.6 on the smaller caps. When power is turned off the voltage drops to zero in about a minute. Doesn't seem right. And if they weren't supposed to do that, why would all "go bad" at the same time? Is there some other defective component allowing them to discharge. When I play it, it sounds very good because I have very efficient speakers and don't need much power, but If I crank it up after a while it starts to distort like the power supply is running out of juice. Any advice would be greatly appreciated.
Hi Great vids and great work. Iv got a 2270 which i love but the Stereo light doest work i did have an engineer look at it and he said and i quote:- there is a slight problem with the FM section the tuning meter is slightly off this is due to a very involved problem in what is called the FM I.F amp/detector stage which i cannot resolve. Also i will have to double check that the stereo lamp is faulty as the mentioned FM problem may affect the stereo decoder which drives the Lamp. ?? Is that correct ?? Thanks again G
What’s the issue with the signal strength meter. I have a 2325 with the same issue going on. But mine doesn’t pick up fm stereo or unmutes the fm muting feature. Great video
Hello I really enjoy your work on youtube. I have a question to ask. I just pick up marantz 2218. I noticed that my left channel is slightly strong and vocal is coming little bit more toward the left speaker. I will have to do more testing but I was not sure this is happening because of transistor going bad, cap issue, recording play back issue or the recording itself. I do not have all the expensive tool to diagnose this issue. Only equipment that I have are ears. If you have simple way to measure output of each setting with multi meter I am open for it too.
Hi Mark, I love all your marantz videos great work! Would it be possible to show us how you remove and install caps from A-Z? As to how you start by removing the board , desoldering and soldering caps because you only show the before and after. I k ow ot must be hard as you'll need a tripod or something to hold the camera. Also, how do you deal with the wire wraps? Sometimes it's simply impossible to work on a board without removing or partially removing the board. But the worse wraps seems to make things even more complex. Again thanks very much! You're awesome! 😎
Sure wish i could find someone as good as you to take care of my 2270 its pretty beat up and needs alot hopefully i can tackle some of it my self im a great solder'er, have u replaced the shaft in the selector switch befor my is broke off and i have been un able to find another i did read that the shaft can be replaced i have a lathe and am familiar with machine work i can make a replacement just unsure how difficult too replace or if im better to find one some how
I have a general question about capacitors and their ratings. If a capacitor has a rating of 4700mfd and 80volts does it mean that at a supply voltage of 80 volts it will hold 4700mfd? If the supply voltage is only 40 volts will it only hold 2350mfd of capacitance? Or would it still charge to full capacitance but in a longer time period? I'm not trying to be a pest, just very curious.
Mark Do you work on meridian hifi products, I love the fact you’re so meticulous, does changing the components from factory specifications alter the sound of the equipment (I’m obviously have zero experienced of electronic)
Any idea why the output transistors were blown? I was worried that it was an upstream problem and that you were running the risk of blowing your new ones.
Yesterday, I finally got my 2270 receiver hooked up...only to find a dead left output, just like this unit had! Would you be able to check mine out & repair it???
Thanks for the video. I don't own a Marantz receiver but much of this information is applicable to most other receivers. I like your tip for orienting the caps before removal. That will save a lot of time reading the schematics and then tracing the signal path on the PCB. I'm currently working on a Dokorder 800X - a beautiful sounding solid state receiver from a company that mostly made reel-to-reel tape recorders. Someone changed all 4 output transistors, but they used different transistors on the left and right channels. I'm also planning on adding heatsinks as the TO-3 tranistors are mounted directly onto the back panel (like an old Sansui.) It gets hot back there.
I've been watching your videos for research purposes. I have a Marantz Model 19 that I need to clean up. The 19 has set screws that hold the knobs on the front panel. Do you happen to know the size of the hex key for those set screws?
I got Marantz model 2270 from a former dj radio host passed away and doesn't make sound from am to fm Just curious how much the repair cost???? Thanxxxx just curious
I have a 2385 that i will love to restore,used to have sound in one channel but i tried to check the output transistors on the bad channel and blew a resistor on it . i guess i shorted something. but seen your videos i have learned how to really troubleshoot most common problems and what to do to bring them back to life. ii want to start by re caping the power supply and then other circuits and then tackle the amp board. do you have any suggestion on what i should do first? I really like and want this monster working again. Thanks Blue for such good videos. I have downloaded already the service manual and next thing to do is gather the parts i need to start.
always start with the power supply, if its not right, nothing else is going to appear to work correctly even when nothing is wrong with the other components
I had a dream you launched a Kickstarter campaign to pay for College for your kids. Then you quit your day job, and you opened a repair store in NYC. Prophecy? We need you here :-)
Luv your videos. Great work. I really need your help. Willing to pay for your advice . My 2270 cracks on bass notes. Both speakers at moderate volume. All new caps . All voltages set. At specs. Clean controls etc. Any ideas? Thanks Curtis
i have marantz 2440 --the right Chanel had a speaker short out and burned to resisters on the out put board.i cant read the color band on them .i am trying to find a repair manual that will show part numbers and descriptions . can you help in this mater it is part #R741 andR737
$330 is an absolute steal for all that work! My local shop charged me $260 just for FM rebuild along with a couple other small things. Wish you were closer, do you get units shipped to you?
Mick, I don't know if you got a reply from Mark or not. If not, if the number on the transistor starts with the letter A or B it's PNP. If it starts with C or D it's NPN. ie:C1116 or A747 as an example. On my Marantz 2325 the PNP's are on the top.
I picked this 2270 up from an original owner about 4 years ago and just recently, the right channel cuts out when I play it in phono but will play properly out of both channels in mono. It does the same thing in AUX mode but I can turn the volume knob up and it will kick the right channel in... what do I need to do?
The AUX input not working until you bump up the volume control is likely due to oxidation and tarnish on the contacts of the output relay. If you can get the relay out and pry the clear plastic cover off of it you can clean and polish the contacts with a pencil eraser. This is NOT something you can cure by spraying control or contact cleaner into the relay, so please don't try that! If you run the receiver with the cover off and you tap the relay cover while the unit is playing , I'll bet you can make that channel pop in-and-out, and thereby confirm my educated guess as to the source of that particular problem. The output from all sources passes through this relay to the speakers, and so it is likely that this problem occurs on all sources, including phono and tuner, as well as the Aux input, but you just haven't noticed it yet. The bad channel on phono that subsequently works through both speakers in mono mode won't be in the output stage of the unit but will be somewhere in the phono preamp circuitry (which is separate from, and in addition to, the preamp circuitry for the other inputs). It could be a defective component, a bad connection, a broken solder joint, or even an intermittent, oxidized connection to section of the input switch that selects. The reason it appears to work in mono is that even though you are missing one channel of audio from the turntable the mono switch blends the 2 channels together somewhere in the preamp and if you have signal working on say only the left channel it will then be shunted over to the right channel as well via the mono switch.
I'm really looking for some help from anyone that might know. I just thought you might have the answer as you always seem to. Any that knows what a concentric potentiometer is that can possibly tell me how to free up the 2 parts of the shaft that turn. Mine are supposed to turn independently but will turn together but if you hold 1 knob tight and then the other knob will turn but very snug. If there's a way to get deoxit in between the metal parts then that might work but not sure how. Can anyone help with an idea? Thanks in advance.
Full recap can be $175-350 depending on the unit. You are talking many caps and many hours of labor. LED is usually a $75 venture standalone, maybe $50-60 if done with other work.
The most tricky issue renovating 2270 is replacing the 2-pin function bulbs, the tuner string gets in the way of your soldering iron. And you don't even mention the issue! Coincidence? Well, I am just a concerned citizen asking questions! :)
Where are you located so I can contact you and you can repair some receivers that I have? Very interested you sound like you know what you’re doing! There is a small speaker repair shop 40 miles south of me, Ithey only focus on restoring speakers which I have taken in for repair.
high I have a 2270 that is all original I'm 52 years old my name is Andrew and I'm not sure where you are but I'm interested on restoring my 2270 would like some what of the top of your head what it would cost and also your location and was wondering how much it would cost to ship? appreciate your response as soon as you can
I go to Doug at DNA electronics in Kitchener. He's a long time well respected tech. You'll know that when you get into his basement and see all the gorgeous gear people entrust him with. He's one of the best out there. If you're in Ontario Canada there's also Syd Beaumont at Ideal Electronics in Ingersoll who is equally good.
I don't know if you will see this or not but I picked up this model of marantz for cheap. Can you message me a rebuild cost just like this one? Just the internals any thing of the cosmetics I want to do. Thank you.
I understand your point. I used to charge low prices, just like you, untill I noticed some people took advantage and I found myself 'drowning', doing all kinds of silly repairs on crappy plastic gear. I never had the guts to reject a job or charge a fair price'.
How can i contact you ? I ha e a 2270 it work great but would love a complete refurb. And yes i know just because it works good means not much 😆 But I would like to get refurb by you ? I am no bullshitter check me page out I have dozens of amps and speakers
